Just to add, when I got home, the coolant was just a touch low. I figured I would give it a tiny topup back to the seem as obviously some had escaped around the cap.  So I waited for it to cool down and the coolant was about another 10mm lower. I opened the cap, which hissed and the level then went almost back up to normal. I understand it expands when hot etc. I've had the car since new and always check the level, it all just seems a bit odd.Or does this sound ok?

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